Aimed at the dry gas seal with bidirectional spiral groove and circular arc groove on the end face of moving ring,considering the heat conduction at the sealing interface,the thermodynamic models of different microstructure sealing pairs under dry friction conditions were established.The friction heat transfer analysis was carried out by the complete thermalmechanical coupling method.The results show that the existence of the microstructure on the end face of the moving ring causes local high temperature hot spots on the contact surface.The hot spots are mainly concentrated around the grooved area,and the high temperature hot spots are periodically distributed along the circumferential direction.The hot spots at the interface of bidirectional spiral groove are concentrated.The maximum temperature of the contact surface of the dynamic and static ring increases more obviously with the increase of the rotating speed and the running time.The influence of microgroove depth on the maximum temperature of the interface is not obvious at the initial stage,as the sliding process progresses,the maximum temperature of shallow groove interface is gradually higher than that of deep groove interface.Under the same rotating speed and groove depth,the temperature rise of arc groove interface is lower than that of the bidirectional spiral groove interface.The equivalent stress distribution on the contact surface of carbon graphite static ring is similar to that in the hot spot area of high temperature,and the thermal stress caused by the local temperature difference on the contact surface is the main factor leading to stress concentration.